Method of and apparatus for removing interior burs from tubes.



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H. E. BUTCHER. METHOD OF AND APPARATUS FOR REMOVING INTERIOR BURS FROM TUBES.

APPL ICATION FILED AUG-14, 191s.

1,21 5,773. Patented Feb. 13, 1917.

way/9 e Q19, m 94 A 772) iewfyo as runes- HARRY E. BUTCHER, F CLEVELAND, OHIO, ASSIGNOR TO THE STANDARD WELDING COMPANY, OF CLEVELAND, OHIO, A CORPORATION OF OHIO.

METHOD OF AND APPARATUS FOR REMOVING INTERIOR BURS To all whom it may concern Be it known that I, HARRY E; BUTCHER, a citizen of the United States, and a resident of Cleveland, county of Cuyahoga, and State of Ohio, have invented a 'new and useful Improvement'in Methods of and Apparatus for Removing Interior Burs from Tubes, of which the following is a specification, the principle of the invention being herein explained and the best mode in which I have contemplated applying that principle, so as to distinguish it from other inventions.

The present improvements relate more especially to the manufacture of butt-welded tubing or pipe by electric welding process, although the field of use is not necessarily limited either to butt-welded tubing or to tubing welded by such electric process, but

is preliminarily formed out of flat strips or sheets with the edges to be welded in abuttingrelation thereupon such edges are place of a heating electric current being blow-pipe, or

agency, is applied to such seam.

pressed together by applying rolls or equivalent means laterally against the preliminarily formed tubing, and a heating electric current is simultaneously passed across such edges so that they are broughtto the proper Welding temperature. As a result, however, of the foregoing operation, the edges necessarily becomes more'or less plastic, or fluid, and is upset, so that a bur. is left, both on the outside and inside ofthe tubing along the seam.

A very similar bur is produced where, in

passed across the seam, an oxy-acetylene similar igneous heating The removal of the bur on the exterior presents no particular difliculty andis not 'of interest in the present connection. It is not so easy a matter, however, to remove the bur from the interior of the tubing, where,

as is frequently the case, it is desirable that theflnterior be perfectly smooth, ,as, for instance, where a rod or other tube is to be. fitted within the first tube. The object of the "present invention accordingly is to provide a simple and expeditious method, with Specification of Letters Patent.

FROM TUBES.

Patented Feb. 313, 1931?,

Application filed August 14, 1915. Serial No. 45,567.

suitable apparatus for use therein, whereby such interior bur may be removed. To the accomplishment of the foregoing and related ends, the invention, then, consists of the steps and means hereinafter fully described and particularly pointed out in the claims.

The annexed drawing and the following method or process, illustrating a section of pipe or tubing in process of being operated on; Fig. 2 is a transverse section of the foregoing taken on the plane indicated by the line 2+2, Fig. 1; and Fig. 3 is also a transverse section of said apparatus taken on the plane indicated by the line 3-3, Fig. 1.

The apparatus illustrated is designed to be employed in conjunction with an ordinary draw-bench, where means are provided for pulling or pushing tubing through dies, or like operating mechanism. The mechanism of interest in the. present instance comprises two pairs of rolls mounted on axes, preferably at right angles to each other. Thus rolls 1, 1 are rotatably mounted upon vertically disposed spindles 2, 2, while rolls the matria1nf--3;-3 arermounted upon'horizontally disposed spindles 4, 4, both sets of spindles, and thus the rolls, being secured in a suitable unitary.

housing 5 adapted to be attached to such draw bench or like support, as will be readily understood.

Both pairs of such rolls are peripherally v grooved, the grooves 6, 6, in the first pair being substantially semi-circular in crosssection and having a radius equal to that of the exterior of the pipe or tubing A to be operated upon, (see Fig. 3). The other pair of rolls, on the contrary, have peripheral grooves 7, 7, which, although curved in cross-section, are of a more or less elliptical form, as indicated in Fig. 2, so that when the pipe or tubing is passed therethrough it will be slightly flattened from its proper circular cross-sectional form. v

Having regard to the direction in which the tubing is being moved, it will first pass through between these flattening rolls 3, 3, which will distort the tubing, giving it the flattened cross-section shown in the figure last referred to. Then such tubing passes through between the other set of rolls 1, 1,

which again restore it to its proper circular cross-section.

, In substantial alinement with the axes of the rolls 3, 3, is supported a cylindrical member 10 of the general form illustrated, said member being held against longitudinal movement by a rod 11 threaded thereto and of sufiicient length to permit the tube or pipe to be passed thereover and 5 allow said rod to be fixedly attached at its other end, (not illustrated). The member 10 itself is made of hardened steel or equivalent cutting material, and has a longitudinal groove 12 formed in its side, such groove terminating short of the farther end of the member, having regard to the direction of travel of the tube; and a passage or opening 13 is formed in the member at an angle inclined to its axis, such passage intersect- 5 ing the forward end of the groove 12 and the adjacentend of the member. A cutting edge 14 is thus formed by the forward acute angle, vwhere this passage intersects such groove, such edge being located in approxi- 3, 3, or a little beyond such plane.

From the foregoing description of the construction of the apparatus it will be obvious that asthe tube is drawn through between said rolls its walls are forcefully p'fessed to conform with the shape of the opening left between the rolls. The tube being so located that the bur a, previously referred to, is directly in line with the longitudinal groove 12 in the member 10 the effect of the reduction in diameter of the tube will beto force such bur into the groove as the plane of the smallest diameter of the opening, such plane coinciding with that in dicated by section line 2-2, Fig. 1, isrape proached, and at the point where such-plane is reached the bur encounters the cutting edge of'the member and is shaven off as illustrated in Fig. 1. The tube, after being thus de-burred, is immediately sprung back f into its proper circular cross-sectional shape bythe rolls 1, 1.

By means of the foregoing construction it will hence be .seen that the removal of the interior bur in tubing of the kind in question is very quickly and simply performed.

It will be understood of course that while in the structure illustrated the rolls 1 for restoring the tube again to its normal crosssection are shown as mounted in the same housing with the rolls 3 which distort the tube incidentally to the deburring operation, such two sets of rolls need not necessarily be thus combined in such close relation.

mately the plane of the axes-of the rolls pipe or tubing from opposite sides in a plane For that matter occasion might possibly arise where it would be unnecessary or undesirable to restore the tube to its normal cross-section; in other words, it might be left in the form produced by the rolls 3 7O incidental to such deburring operation. Again the deburring operation may be performed with the appropriate set of rolls operating; in conjunction with the cutting member 10 at one time and place, and then be subsequently rounded again into proper shape elsewhere with a set of rolls like rolls 1 of the illustrated apparatus.

Other modes of applying the principle of my invention may be employed instead of the one explained, change being made as regards the steps or mechanism herein (lisclosed, provided the means stated by any of the following claims or the equivalent of such stated means be employed.

I therefore particularly point out and distinctly claim as my invention 1. The method of removing a bur, or the like, from the interior of pipe or tubing, which consists in passing such pipe or tubing over asuitable member within the same provided with a cutting edge normally out of operative contact with the interior; and simultaneously deflecting the portion of the wall of such pipe or tubing to be operated upon into engagement with such cutting e e.

The method of removing a bur, or the like, from the interior of pipe or tubing, which consists in passing such pipe or tubing over a suitable member within the same provided with a cutting edge normally out of operative contact with the interior; simultaneously deflecting the portion of the wall of such pipe or tubing to be operated upon into engagement with such cutting edge; and thereupon restoring such wall-portion to its normal position.

3. The method of removing a bur, or the like, from the interior of pipe or tubing, which consists in passing such pipe or tubing over a suitable member within the same provided with a cutting edge normally out of operative contact with the interior; and simultaneously pressing inwardly upon such approximately co-incident with such cutting" edge so as to deflect the portion of its wall to be operated upon into engagement with such cutting edge.

4. The method of removing a bur,'or the like, from the interior of pipe or tubing, which consists in passing such pipe or tubing over a suitable member within the same provided with a cutting edge normally out of operative contact with the interior; simultaneously .pressing inwardly upon such pipe or tubing from opposite sides in a plane approximately co-incident with such cutting edge so as to deflect the portion of its wall to 1st be operated upon into enga ent with such cutting edge; and therea r pressing inwardly upon such pipe or tubing from opposite sides at right angles to such firstmentioned sides, so as to restore the pipe or -tubing to its normal cross-section.

apparatus of the class described, the combination with a suitable member adapted to be inserted and held within a section of pipe or tubingand provided with a cutting edge normally out of operative contact with the interior thereof; of means adapted to deflect' the portion of the wall of such pipe or tubing to be operated on into engagement with such cutting edge. 1

6. In apparatus of the class described, the combination with a suitable member adapted to be inserted and held within a section of pipe or tubingand provided with a cutting edge normally out of operative contact with the interior thereof; of means located in a plane substantially co-incident with such cutting edge and adapted to press inwardly upon such pipe or tubing from opposite sides so as to deflect the portion of its wall to be operated upon into engagement with such cutting edge.

7. In apparatus of the clam described, the combination with a suitable member adapted to be inserted and held within a section of pipe or tubing and provided with a cutting edge normally out of o erative contact with the interior thereof; 0 means located in a plane substantially co-incident with such cutting edge and adapted to press inwardly upon such pipe or tubing fromopposite sides so as to deflect the portion of its wall to be operated upon into engagement with such cutting edge; and other means adapted to press upon such pipe or tubing from opposite sides at right angles to such first-mentioned sides, so as to restore the pipe or tubing to its normal cross-section. v

8. In apparatus of the class described, the combination with a member of general cylindrical form adapted to be inserted within a section of pipe or tubing and provided with a cutting edge normally out of operative contact with the interior wall thereof;

of means adapted to hold said member in position; a pair of rolls' mounted on parallel axes and adapted to press inwardly upon such pipe or tubing from opposite sides in a plane substantially coincident with such cutting edge, one such roll being disposed to deflect the portion of the wall to be operated upon into engagement with such cutting edge; and a second pair of rolls mounted on parallel axes lying at right angles to, and spaced from, those of such first pair, said second pair of rolls being also adapted to press inwardly uponsuch pipe or tubing so as to restore the same to its normalcrosssection.

VELMA L; WILLIAMS, R. C. Cooper.

Signed by me, this 12 day of August, 

